Science Keywords is a required field. Science Keywords: Select from 3 to 5 items. 0 Assigned ID: 2561 ----- Attempting Submission 1 (Thu Jan 08 17:24:33 GMT 2015) ----- joint 0 ----- Attempting Submission 1 (Fri Jan 30 18:37:44 GMT 2015) ----- Exploring the Dust-Gas Connection in the Protoplanetary Disk of GM Aur Previous Spitzer infrared observations of disks around young, low-mass pre-main sequence stars have given us an unprecedented look at dust evolution in young objects, particularly in disks which were revealed to have large inner holes (i.e., the transitional disks). Despite this ground-breaking progress in studying the dust in young disks, the relationship between the dust and gas properties in the inner disk remains essentially unknown. Here we propose to quantify the variability of both the dust and gas in the transitional disk surrounding GM Aur to study how or if accretion onto the star is tied to inhomogeneities in the inner disk. To do this, we will use simultaneous Spitzer, HST, and Swift observations to constrain the IR, UV, and Xray emission of GM Aur and provide a picture of the interaction between dust and gas in the inner ~0.5-1 AU of the disk down to the stellar surface. There will be 2 visits of the target GM Aur. The visits will be separated by approximately 1 week. MAMA FUV and NUV observations will be done using the G140L and G230L gratings which cover 1150-1730 A and 1570-3180 A. Simultaneous optical and near-IR spectra will be taken using the CCD G430L grating (2900-5700 A) and the CCD G750L grating (5240-10270 A). We will also do fringe-flats to correct the spectra beyond 7000 A. We note that since this is a variability study we will need to use the STIS MAMA and the CCD in the same visit and since the CCD observations will take about 30 minutes, this visit structure is allowed according to the HST primer. --------- Additional Comments ---------- These visits will be simultaneous to Spitzer observations of GM Aur. Spitzer and HST visibility windows overlap between January 5 and January 10, 2016. We request that GM Aur be observed at the beginning of the window (January 5) for visit 1 and the end of this window (January 10) for visit 2 to allow for the greatest time span between the two epochs. This request has been specified using the timing requirements for each epoch. GM Aur is flagged as a health/safety concern by the BOT for the NUV G230L exposure. GM Aur has been observed with the G230L grating on 5 separate occasions and has not exceeded the brightness limit. We know the spectral type of GM Aur is ~K4-K5, not O5 as assumed by the BOT. DEBRIS DISKS Default false false false false false SUPPORTED STAR CIRCUMSTELLAR MATTER PRE-MAIN SEQUENCE STAR T TAURI STAR J2000 J2000 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/CCD Spectroscopic No No G750L 7751 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/CCD Spectroscopic No No G750L 7751 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /Users/lingleby/Proposals/HST2014/OP-cache/hst_spitzer_phaseII-v01.xml This visit should be simultaneous with Spitzer observations. (Tic-Visit :proposal-id 14048 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "21-Jan-2015 12:05:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 339072 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14048 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14048 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14048 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3035 :al-overhead-at-end 239 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /Users/lingleby/Proposals/HST2014/OP-cache/hst_spitzer_phaseII-v02.xml This visit should be simultaneous with Spitzer observations. (Tic-Visit :proposal-id 14048 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "21-Jan-2015 12:04:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 339072 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14048 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14048 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2924 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14048 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3035 :al-overhead-at-end 239 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 2 0